http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Chun, Yoon-Keun,Ha, Joo-hun,Hong-Jung-Woo,Oh, Soo-Myung,Kim, Sung-Soo 경희대학교 동서의학연구소 1999 INTERNATIONAL SYMPOSIUM ON EAST-WEST MEDICINE Vol.1999 No.1
Yoon-Keun Chun¹,Joohun Ha□Hong-Jung Woo□, Soo Myung Oh□,Sung Soo Kim□ ¹Department of Molecular Biology, College of Medicine,²Department of Surgery, college of Medicine,³Department of Internal Medicine, College of Oriental Medicine,and ⁴East-Weat Medical Reserch Institute,Kyung Hee University, Seoul, Korea. The HBV DNA Amounts in Serum Have No relationship with ALT level and Hetergeneous Population Coexits in Chronic Hepatitis B Virus Infection. Proceedings of International Symposium on East-West Medicine, Seoul. 212-230, 1999. -Hepatitis B is caused by hepadnavirus. Hepatitis B virus replicates through 3.5kb pregenomic RNA intermediate which is regulated by core promoter. Pathogenesis of hepatitis B virus has been bilieved the result of host immune response. But recently many studies have reported that high level of viral replication caused by mutation in core promoter might result in severs hepatitis. But these studies were performed in vitro, not in vivo. So there is yet debate about which factor, viral of host factor, is more important in pathogenesis of hepatitis B virus. So we measured real viral replication level in 204 chronic hepatitis B patients by quantifying HBV DNA from sera by our novel PCR-based more sensitive method, and compared these results with ALT level measured from same sera, which indicates liver cell damage. Surprisingly there are no significant correlation between HBV DNA quantity and ALT level. Then we cloned core promoter region. In SSCP, we found that many viral mutants coexist in one patient. Base on SSCP result, we chose main viral core promoter type in each patients, which is thought to determine overall viral replication level in this patient. Main type of core promoter region of each 41 patients were directly sequenced. And with these we measured promoter activity by luciferase assay system and compared promoter activity with on another. We found tha there were some differences in promoter activity according to core promoter sequences. And we constructed replication-competent viral constructs with core promoter from 41 patients and Transfected these into HepG2 cell and measured HBV DNA by southern blot. There were also differences in HBV DNA quantity according to core promoter sequences. On these all results we investigated correlation between the effect of HBV core promoter on viral replication in vitro and HBN DNA quantity, ALT level from sera of each patients. We found there is no significant correlation among them. As a result, we concluded that in determining severity chronic hepatitis B patients, host factors of each patient is more important rather than replicative activity of virus itself.
중금속 오염 논토양에서 카드뮴의 부동화와 식물이용성에 대한 석회 시용 효과
홍창오 ( Chang Oh Hong ),김용균 ( Yong Gyun Kim ),이상몽 ( Sang Mong Lee ),박현철 ( Hyean Cheal Park ),김근기 ( Keun Ki Kim ),손홍주 ( Hong Joo Son ),조재환 ( Jae Hwan Cho ),김필주 ( Pil Joo Kim ) 한국환경농학회 2013 한국환경농학회지 Vol.32 No.1
석회시용에 의한 카드뮴의 부동화와 식물이용성 저감효과를 구명하기 위해 우리나라의 대표적인 석회비료인 소석회를 선정하여 소석회에 의한 논토양 내 카드뮴의 부동화 기작과 벼의 카드뮴 흡수특성을 조사하였다. 소석회는 토양의 pH와 음하전도를 증대시켜 카드뮴의 흡착을 증대시키는 것으로 조사되었다. 소석회의 처리량을 증가시킴에 따라 식물이 이용하기 쉬운 형태인 유효태 카드뮴과 치환성 및 carbonate 결합태 카드뮴의 함량이 유의적으로 감소하였다. 소석회를 8,000 mg/kg 과량으로 시용하였을 때 CdCO3 형태로의 침전이 가능하였을 것으로 판단되나 8,000 mg/kg 이하로 처리하였을 때 CdCO3나 Cd(OH)2 형태로의 침전은 없었던 것으로 조사되었다. 또한 토양의 pH와 음하전도는 유효태 카드뮴과치환성 및 carbonate 결합태 카드뮴의 함량과 유의한 부의상관관계를 나타내었다. 따라서 소석회에 의한 토양 내 카드뮴의 부동화는 CdCO3나 Cd(OH)2 형태로의 침전형성에 의한 것이 아니라 pH와 음하전도의 증대에 기인된 카드뮴 이온의 흡착에 의한 것으로 판단되어 졌다. 논토양의 현장조건에서 소석회의 시용에 의한 벼의 카드뮴 흡수농도 저감효과를 시험한 결과, 소석회의 시용량을 증가시킴에 따라 벼의 카드뮴 흡수농도는 유의적으로 감소하는 결과를 나타내었다. Research Article : BACKGROUND : Many studies associated with cadmium (Cd) immobilization using lime fertilizer have been conducted for several decades. However, these studies did not suggest exact mechanism of Cd immobilization using lime fertilizer and evaluated effect of lime fertilizer on Cd phytoavailability in rice paddy soil under field condition. METHODS AND RESULTS: This study was conducted to determine exact mechanism of Cd immobilization using lime fertilizer and evaluate liming effect on Cd uptake of rice in contaminated paddy soil. Ca(OH)2 was mixed with Cd contaminated arable soil at rates corresponding to 0, 1,000, 2,000, 4,000, and 8,000 mg/kg. The limed soil was moistened to paddy soil condition, and incubated at 25℃ for 4 weeks. NH4OAc extractable Cd concentration in soil decreased significantly with increasing Ca(OH)2 rate, since Ca(OH)2 markedly increased net negative charge of soil by pH increase, and decreased bioavailable Cd fractions (F1; exchangeable + acidic and reducible Cd fraction). Calculated solubility diagram indicated that Cd solubility was controlled by soil-Cd. NH4OAc extractable Cd and F1 concentration were negatively related to soil pH and negative charge. Ca(OH)2 was applied at rates 0, 2, 4, and 8 Mg/ha and then cultivated rice in the paddy soil under field condition. Cadmium concentrations in grain, straw, and root of rice plant decreased significantly with increasing application rate of Ca(OH)2. CONCLUSION(S): Alleviation of Cd phytoavailability with Ca(OH)2 can be attributed primarily to Cd immobilization due to the increase in soil pH and negative charge rather than precipitation of Cd(OH)2 or CdCO3, and therefore, Ca(OH)2 is effective for reducing Cd phytoavailability of rice in paddy soil.
Nutrient Balances and Soil Properties Affected by Application of Soybean and Barley Residues
Oh, Taek-Keun,Sonn, Yeon-Kyu,Lee, Dong Sung,Kim, Myung-Sook,Kim, Seok-Cheol,Yun, Hong Bae,Lee, Deog-Bae,Lee, Chang-Hoon Korean Society of Soil Science and Fertilizer 2014 한국토양비료학회지 Vol.47 No.2
An accurate analysis of nutrient balance in different cropping systems is necessary for improving soil fertilities, causing higher crop yields and quality. This study was carried out to investigate the nutrient balance, changes in soil properties, and their effects on crop yield in long-term field cultivation under mono- and rotation-cropping systems (MCS and RCS, respectively). The analytical results of the soil properties showed that the application of mineral fertilizers alone in the MCS leads the reduction of soil CEC, exchangeable Ca, and microbial biomass C and N. Compared with the MCS of soybean, the RCS of soybean and barley significantly improved the soil properties, which increased crop yield. It might be due to the barley residue added to the RCS soil. Mean nutrient balances for 4 years were -55.9 kg N, +34.7 kg $P_2O_5$, and -0.3 kg $K_2O$ $ha^{-1}$ for the MCS and +19.7 kg N, +107.4 kg $P_2O_5$, and -48.6 kg $K_2O$ $ha^{-1}$ for the RCS, respectively. These nutrient imbalances mean that conventional fertilizer recommendations were inadequate for maintaining soil nutrient balance. From these results, we can conclude that the crop rotation may change comprehensive physical, chemical, and biological soil properties. These changes could affect the nutrient balance and then the crop yield.
A Case of Multiple Agminated Spitz Nevi Showing Desmoplastic Changes
Oh, Chang Keun,Jang, Ho Sun,Kwon, Kyung Sool,Chung, Tae Ahn,Yim, Chae Sung,Cho, Si Hyung 대한피부과학회 1998 Annals of Dermatology Vol.10 No.3
We report a case of multiple agminated Spitz nevi in a 16-year-old boy who presented with multiple nodules on the right side of his face. His past history revealed that there had been erythematous and brown colored papules on the same site at the age of four. At that time one lesion was excised and histopathological findings showed fairly well circumscribed spindle and epithelioid cell nests consistent with a Spitz nevus. Twelve years later, he presented with multiple agminated brown to black colored nodules on the face. Microscopic evaluation revealed nevus cells diffusely distributed throughout the dermis showing no or little functional activity. In addition, these cells were embedded in a strikingly desmoplastic stroma which consisted of acellular collagen fiber. Immunohistochemical staining for S-100 protein was positive. To our knowledge this is the first report of multiple agminated Spitz nevi in Korea.
Sung, Jwakyung,Cho, Minji,Sonn, Yeonkyu,Yun, Hejin,Kang, Seongsoo,Shinogi, Yoshiyuki,Oh, Taek-Keun FACULTY OF AGRIC PUBLICATIONS-KYUSHU UNIV 2016 Journal of the Faculty of Agriculture, Kyushu Univ Vol. No.
<P>Both low and high temperatures affect plant growth and development at whole plant level, tissue and even cell level through a variety of metabolic changes. In this paper we investigated the extent of the inhibition of growth, macro element uptake and soluble carbohydrate production, and the effect of extra-supply of minerals as a means of the recovery from the damage. Lettuce plants were grown four different growth temperatures (15/8, 22/15, 25/18 and 28/21 degrees C), and extra-supply of minerals was composed of 1.5- and 2.0-fold stronger than the standard nutrition (1/2 strength of Hoagland's solution). Low and high temperatures significantly adversely affected lettuce growth, mineral uptake and soluble carbohydrate production, and the extra-supply of minerals didn't play any crucial roles to promote and recover them. Merely, P uptake was slightly increased by an extra-supply of nutrients in all temperature conditions. From this study, it was strongly suggested that further research should include the effect of extra-supply of minerals when plants are recovered from low or high temperature stress, and metabolic interaction such as mineral uptake and carbohydrates between shoot and root.</P>
Oh, Sewoung,Jun, Dong Hwan,Shin, Keun Wook,Choi, InHye,Jung, Sang Hyun,Choi, JeHyuk,Park, Wonkyu,Park, Yongjo,Yoon, Euijoon IEEE 2016 IEEE journal of photovoltaics Vol.6 No.4
<P>We proposed a new scheme, controlling the crack formation by notch patterns, to fabricate self-isolated high-efficiency gallium arsenide (GaAs)-based solar cells on a silicon (Si) substrate. The notch patterns introduced into the Si substrate were found to successfully generate the crack-free areas of 2 mm x 2 mm size separated by the cracks for the 5.8-mu m-thick GaAs layers on it. The individual solar cells on the crack-free areas were confirmed to be electrically isolated from one another by the well-defined crack array. The open-circuit voltage and the efficiency of the crack-free cell were improved to 0.87 V and 18.0%, respectively, from 0.78 V and 14.7% for the cell with 33.2 cm(-1) of linear crack density.</P>